Fix missing paren in review bot.
Fix missing paren in review bot.

Reviewed at https://reviews.apache.org/r/27880/

rosmo/aurora,apache/aurora,apache/aurora,shahankhatch/aurora,mschenck/aurora,protochron/aurora,mschenck/aurora,rdelval/aurora,kidaa/aurora,mschenck/aurora,rdelval/aurora,medallia/aurora,kidaa/aurora,shahankhatch/aurora,thinker0/aurora,kidaa/aurora,thinker0/aurora,rosmo/aurora,medallia/aurora,shahankhatch/aurora,thinker0/aurora,thinker0/aurora,apache/aurora,medallia/aurora,protochron/aurora,crashlytics/aurora,medallia/aurora,thinker0/aurora,medallia/aurora,wfarner/aurora,medallia/aurora,shahankhatch/aurora,crashlytics/aurora,kidaa/aurora,shahankhatch/aurora,rosmo/aurora,protochron/aurora,kidaa/aurora,mschenck/aurora,wfarner/aurora,mschenck/aurora,rdelval/aurora,apache/aurora,rosmo/aurora,protochron/aurora,crashlytics/aurora,kidaa/aurora,mschenck/aurora,crashlytics/aurora,crashlytics/aurora,wfarner/aurora,protochron/aurora,shahankhatch/aurora,rosmo/aurora,rdelval/aurora,crashlytics/aurora,thinker0/aurora,apache/aurora,apache/aurora,rdelval/aurora,rosmo/aurora,protochron/aurora,rdelval/aurora,wfarner/aurora,wfarner/aurora,wfarner/aurora